# @types/d3-geo

- Version 3.0.2
- Published
- 65.5 kB
- 1 dependency
- MIT license

## Install

`npm i @types/d3-geo`

`yarn add @types/d3-geo`

`pnpm add @types/d3-geo`

## Overview

TypeScript definitions for D3JS d3-geo module

## Index

### Variables

### Functions

- geoAlbers()
- geoAlbersUsa()
- geoArea()
- geoAzimuthalEqualArea()
- geoAzimuthalEqualAreaRaw()
- geoAzimuthalEquidistant()
- geoAzimuthalEquidistantRaw()
- geoBounds()
- geoCentroid()
- geoCircle()
- geoClipCircle()
- geoClipRectangle()
- geoConicConformal()
- geoConicConformalRaw()
- geoConicEqualArea()
- geoConicEqualAreaRaw()
- geoConicEquidistant()
- geoConicEquidistantRaw()
- geoContains()
- geoDistance()
- geoEqualEarth()
- geoEqualEarthRaw()
- geoEquirectangular()
- geoEquirectangularRaw()
- geoGnomonic()
- geoGnomonicRaw()
- geoGraticule()
- geoGraticule10()
- geoIdentity()
- geoInterpolate()
- geoLength()
- geoMercator()
- geoMercatorRaw()
- geoNaturalEarth1()
- geoNaturalEarth1Raw()
- geoOrthographic()
- geoOrthographicRaw()
- geoPath()
- geoProjection()
- geoProjectionMutator()
- geoRotation()
- geoStereographic()
- geoStereographicRaw()
- geoStream()
- geoTransform()
- geoTransverseMercator()
- geoTransverseMercatorRaw()

### Interfaces

### Type Aliases

## Variables

### variable geoClipAntimeridian

`const geoClipAntimeridian: (stream: GeoStream) => GeoStream;`

A clipping function transforming a stream such that geometries (lines or polygons) that cross the antimeridian line are cut in two, one on each side. Typically used for pre-clipping.

## Functions

### function geoAlbers

`geoAlbers: () => GeoConicProjection;`

The Albers’ equal area-conic projection. This is a U.S.-centric configuration of d3.geoConicEqualArea.

### function geoAlbersUsa

`geoAlbersUsa: () => GeoProjection;`

A U.S.-centric composite projection of three d3.geoConicEqualArea projections: d3.geoAlbers is used for the lower forty-eight states, and separate conic equal-area projections are used for Alaska and Hawaii. Note that the scale for Alaska is diminished: it is projected at 0.35× its true relative area.

Composite consist of several projections that are composed into a single display. The constituent projections have fixed clip, center and rotation, and thus composite projections do not support projection.center, projection.rotate, projection.clipAngle, or projection.clipExtent.

### function geoArea

`geoArea: ( object: | ExtendedFeature | ExtendedFeatureCollection | GeoGeometryObjects | ExtendedGeometryCollection) => number;`

Returns the spherical area of the specified GeoJSON object in steradians. This is the spherical equivalent of path.area.

### function geoAzimuthalEqualArea

`geoAzimuthalEqualArea: () => GeoProjection;`

The azimuthal equal-area projection.

### function geoAzimuthalEqualAreaRaw

`geoAzimuthalEqualAreaRaw: () => GeoRawProjection;`

The raw azimuthal equal-area projection.

### function geoAzimuthalEquidistant

`geoAzimuthalEquidistant: () => GeoProjection;`

The azimuthal equidistant projection.

### function geoAzimuthalEquidistantRaw

`geoAzimuthalEquidistantRaw: () => GeoRawProjection;`

The raw azimuthal equidistant projection.

### function geoBounds

`geoBounds: ( object: | ExtendedFeature | ExtendedFeatureCollection | GeoGeometryObjects | ExtendedGeometryCollection) => [[number, number], [number, number]];`

Returns the spherical bounding box for the specified GeoJSON object. The bounding box is represented by a two-dimensional array: [[left, bottom], [right, top]], where left is the minimum longitude, bottom is the minimum latitude, right is maximum longitude, and top is the maximum latitude. All coordinates are given in degrees. (Note that in projected planar coordinates, the minimum latitude is typically the maximum y-value, and the maximum latitude is typically the minimum y-value.) This is the spherical equivalent of path.bounds.

### function geoCentroid

`geoCentroid: ( object: | ExtendedFeature | ExtendedFeatureCollection | GeoGeometryObjects | ExtendedGeometryCollection) => [number, number];`

Returns the spherical centroid of the specified GeoJSON object. This is the spherical equivalent of path.centroid.

### function geoCircle

`geoCircle: { (): GeoCircleGenerator; <Datum>(): GeoCircleGenerator<any, Datum>; <This, Datum>(): GeoCircleGenerator<This, Datum>;};`

Returns a new geo circle generator

Returns a new geo circle generator

The generic corresponds to the data type of the first argument passed into the geo circle generator and its accessor functions.

Returns a new geo circle generator

The first generic corresponds to the "this" context within which the geo circle generator and its accessors will be invoked.

The second generic corresponds to the data type of the first argument passed into the geo circle generator and its accessor functions.

### function geoClipCircle

`geoClipCircle: (angle: number) => (stream: GeoStream) => GeoStream;`

Generates a clipping function transforming a stream such that geometries are bounded by a small circle of radius angle around the projection’s center. Typically used for pre-clipping.

#### Parameter angle

A clipping angle.

### function geoClipRectangle

`geoClipRectangle: ( x0: number, y0: number, x1: number, y1: number) => (stream: GeoStream) => GeoStream;`

Generates a clipping function transforming a stream such that geometries are bounded by a rectangle of coordinates [[x0, y0], [x1, y1]]. Typically used for post-clipping.

#### Parameter x0

x0 coordinate.

#### Parameter y0

y0 coordinate.

#### Parameter x1

x1 coordinate.

#### Parameter y1

y1 coordinate.

### function geoConicConformal

`geoConicConformal: () => GeoConicProjection;`

The conic conformal projection. The parallels default to [30°, 30°] resulting in flat top.

### function geoConicConformalRaw

`geoConicConformalRaw: (phi0: number, phi1: number) => GeoRawProjection;`

The raw conic conformal projection.

### function geoConicEqualArea

`geoConicEqualArea: () => GeoConicProjection;`

The Albers’ equal-area conic projection.

### function geoConicEqualAreaRaw

`geoConicEqualAreaRaw: (phi0: number, phi1: number) => GeoRawProjection;`

The raw Albers’ equal-area conic projection.

### function geoConicEquidistant

`geoConicEquidistant: () => GeoConicProjection;`

The conic equidistant projection.

### function geoConicEquidistantRaw

`geoConicEquidistantRaw: (phi0: number, phi1: number) => GeoRawProjection;`

The raw conic equidistant projection.

### function geoContains

`geoContains: ( object: | ExtendedFeature | ExtendedFeatureCollection | GeoGeometryObjects | ExtendedGeometryCollection, point: [number, number]) => boolean;`

Returns true if and only if the specified GeoJSON object contains the specified point, or false if the object does not contain the point. The point must be specified as a two-element array [longitude, latitude] in degrees. For Point and MultiPoint geometries, an exact test is used; for a Sphere, true is always returned; for other geometries, an epsilon threshold is applied.

### function geoDistance

`geoDistance: (a: [number, number], b: [number, number]) => number;`

Returns the great-arc distance in radians between the two points a and b. Each point must be specified as a two-element array [longitude, latitude] in degrees.

#### Parameter a

Point specified as a two-element array [longitude, latitude] in degrees.

#### Parameter b

Point specified as a two-element array [longitude, latitude] in degrees.

### function geoEqualEarth

`geoEqualEarth: () => GeoProjection;`

The Equal Eartch projection, by Bojan Šavrič et al., 2018.

### function geoEqualEarthRaw

`geoEqualEarthRaw: () => GeoRawProjection;`

The raw Equal Earth projection, by Bojan Šavrič et al., 2018.

### function geoEquirectangular

`geoEquirectangular: () => GeoProjection;`

The equirectangular (plate carrée) projection.

### function geoEquirectangularRaw

`geoEquirectangularRaw: () => GeoRawProjection;`

The raw equirectangular (plate carrée) projection.

### function geoGnomonic

`geoGnomonic: () => GeoProjection;`

The gnomonic projection.

### function geoGnomonicRaw

`geoGnomonicRaw: () => GeoRawProjection;`

The raw gnomonic projection.

### function geoGraticule

`geoGraticule: () => GeoGraticuleGenerator;`

Constructs a feature generator for creating graticules: a uniform grid of meridians and parallels for showing projection distortion. The default graticule has meridians and parallels every 10° between ±80° latitude; for the polar regions, there are meridians every 90°.

### function geoGraticule10

`geoGraticule10: () => GeoJSON.MultiLineString;`

A convenience method for directly generating the default 10° global graticule as a GeoJSON MultiLineString geometry object.

### function geoIdentity

`geoIdentity: () => GeoIdentityTransform;`

Returns the identity transform which can be used to scale, translate and clip planar geometry.

### function geoInterpolate

`geoInterpolate: ( a: [number, number], b: [number, number]) => (t: number) => [number, number];`

Returns an interpolator function given two points a and b. Each point must be specified as a two-element array [longitude, latitude] in degrees.

#### Parameter a

Point specified as a two-element array [longitude, latitude] in degrees.

#### Parameter b

Point specified as a two-element array [longitude, latitude] in degrees.

### function geoLength

`geoLength: ( object: | ExtendedFeature | ExtendedFeatureCollection | GeoGeometryObjects | ExtendedGeometryCollection) => number;`

Returns the great-arc length of the specified GeoJSON object in radians. For polygons, returns the perimeter of the exterior ring plus that of any interior rings. This is the spherical equivalent of path.measure.

### function geoMercator

`geoMercator: () => GeoProjection;`

The spherical Mercator projection. Defines a default projection.clipExtent such that the world is projected to a square, clipped to approximately ±85° latitude.

### function geoMercatorRaw

`geoMercatorRaw: () => GeoRawProjection;`

The raw spherical Mercator projection.

### function geoNaturalEarth1

`geoNaturalEarth1: () => GeoProjection;`

The Natural Earth projection is a pseudocylindrical projection designed by Tom Patterson. It is neither conformal nor equal-area, but appealing to the eye for small-scale maps of the whole world.

### function geoNaturalEarth1Raw

`geoNaturalEarth1Raw: () => GeoRawProjection;`

The raw pseudo-cylindircal Natural Earth projection.

### function geoOrthographic

`geoOrthographic: () => GeoProjection;`

The orthographic projection.

### function geoOrthographicRaw

`geoOrthographicRaw: () => GeoRawProjection;`

The raw orthographic projection.

### function geoPath

`geoPath: { ( projection?: GeoProjection | GeoStreamWrapper | null, context?: GeoContext | null ): GeoPath; <DatumObject extends unknown>( projection?: GeoProjection | GeoStreamWrapper, context?: GeoContext ): GeoPath<any, DatumObject>; <This, DatumObject extends unknown>( projection?: GeoProjection | GeoStreamWrapper, context?: GeoContext ): GeoPath<This, DatumObject>;};`

Creates a new geographic path generator.

The default projection is the null projection. The null projection represents the identity transformation, i.e. the input geometry is not projected and is instead rendered directly in raw coordinates. This can be useful for fast rendering of pre-projected geometry, or for fast rendering of the equirectangular projection.

The default context is null, which implies that the path generator will return an SVG path string.

#### Parameter projection

An (optional) current projection to be used. Typically this is one of D3’s built-in geographic projections; however, any object that exposes a projection.stream function can be used, enabling the use of custom projections. See D3’s transforms for more examples of arbitrary geometric transformations. Setting the projection to "null" uses the identity projection. The default value is "null", the identity projection.

#### Parameter context

An (optional) rendering context to be used. If a context is provided, it must at least implement the interface described by GeoContext, a subset of the CanvasRenderingContext2D API. Setting the context to "null" means that the path generator will return an SVG path string representing the to be rendered object. The default is "null".

Creates a new geographic path generator with the default settings.

The default projection is the null projection. The null projection represents the identity transformation: the input geometry is not projected and is instead rendered directly in raw coordinates. This can be useful for fast rendering of pre-projected geometry, or for fast rendering of the equirectangular projection.

The default context is null, which implies that the path generator will return an SVG path string.

The generic corresponds to the type of the DatumObject which will be passed into the geo path generator for rendering

#### Parameter projection

An (optional) current projection to be used. Typically this is one of D3’s built-in geographic projections; however, any object that exposes a projection.stream function can be used, enabling the use of custom projections. See D3’s transforms for more examples of arbitrary geometric transformations. Setting the projection to "null" uses the identity projection. The default value is "null", the identity projection.

#### Parameter context

An (optional) rendering context to be used. If a context is provided, it must at least implement the interface described by GeoContext, a subset of the CanvasRenderingContext2D API. Setting the context to "null" means that the path generator will return an SVG path string representing the to be rendered object. The default is "null".

Creates a new geographic path generator with the default settings.

The default projection is the null projection. The null projection represents the identity transformation: the input geometry is not projected and is instead rendered directly in raw coordinates. This can be useful for fast rendering of pre-projected geometry, or for fast rendering of the equirectangular projection.

The default context is null, which implies that the path generator will return an SVG path string.

The first generic corresponds to the "this"-context within which the geo path generator will be invoked. This could be e.g. the DOMElement bound to "this" when using selection.attr("d", ...) with the path generator.

The second generic corresponds to the type of the DatumObject which will be passed into the geo path generator for rendering.

#### Parameter projection

An (optional) current projection to be used. Typically this is one of D3’s built-in geographic projections; however, any object that exposes a projection.stream function can be used, enabling the use of custom projections. See D3’s transforms for more examples of arbitrary geometric transformations. Setting the projection to "null" uses the identity projection. The default value is "null", the identity projection.

#### Parameter context

An (optional) rendering context to be used. If a context is provided, it must at least implement the interface described by GeoContext, a subset of the CanvasRenderingContext2D API. Setting the context to "null" means that the path generator will return an SVG path string representing the to be rendered object. The default is "null".

### function geoProjection

`geoProjection: (project: GeoRawProjection) => GeoProjection;`

Constructs a new projection from the specified raw projection, project. The project function takes the longitude and latitude of a given point in radians, often referred to as lambda (λ) and phi (φ), and returns a two-element array [x, y] representing its unit projection. The project function does not need to scale or translate the point, as these are applied automatically by projection.scale, projection.translate, and projection.center. Likewise, the project function does not need to perform any spherical rotation, as projection.rotate is applied prior to projection.

If the project function exposes an invert method, the returned projection will also expose projection.invert.

### function geoProjectionMutator

`geoProjectionMutator: ( factory: (...args: any[]) => GeoRawProjection) => () => GeoProjection;`

Constructs a new projection from the specified raw projection factory and returns a mutate function to call whenever the raw projection changes. The factory must return a raw projection. The returned mutate function returns the wrapped projection.

When creating a mutable projection, the mutate function is typically not exposed.

### function geoRotation

`geoRotation: ( angles: [number, number] | [number, number, number]) => GeoRotation;`

Returns a rotation function for the given angles.

#### Parameter angles

A two- or three-element array of numbers [lambda, phi, gamma] specifying the rotation angles in degrees about each spherical axis. (These correspond to yaw, pitch and roll.) If the rotation angle gamma is omitted, it defaults to 0.

### function geoStereographic

`geoStereographic: () => GeoProjection;`

The stereographic projection.

### function geoStereographicRaw

`geoStereographicRaw: () => GeoRawProjection;`

The raw stereographic projection.

### function geoStream

`geoStream: ( object: | ExtendedFeature | ExtendedFeatureCollection | GeoGeometryObjects | ExtendedGeometryCollection, stream: GeoStream) => void;`

Streams the specified GeoJSON object to the specified projection stream. While both features and geometry objects are supported as input, the stream interface only describes the geometry, and thus additional feature properties are not visible to streams.

### function geoTransform

`geoTransform: <T extends GeoTransformPrototype>( methods: T) => { stream(s: GeoStream): T & GeoStream };`

Defines an arbitrary transform using the methods defined on the specified methods object. Any undefined methods will use pass-through methods that propagate inputs to the output stream.

#### Parameter methods

An object with custom method implementations, which are used to create a transform projection.

### function geoTransverseMercator

`geoTransverseMercator: () => GeoProjection;`

The transverse spherical Mercator projection. Defines a default projection.clipExtent such that the world is projected to a square, clipped to approximately ±85° latitude.

### function geoTransverseMercatorRaw

`geoTransverseMercatorRaw: () => GeoRawProjection;`

The raw transverse spherical Mercator projection.

## Interfaces

### interface ExtendedFeature

`interface ExtendedFeature< GeometryType extends GeoGeometryObjects | null = GeoGeometryObjects | null, Properties extends GeoJSON.GeoJsonProperties = GeoJSON.GeoJsonProperties> extends GeoJSON.GeoJsonObject {}`

A GeoJSON-style Feature which support features built on GeoJSON GeometryObjects or GeoSphere.

The first generic refers to the type(s) of d3-geo geometry objects underlying the ExtendedFeature. Unless explicitly ruled out, the geometry value is nullable.

The second generic refers to the data type of the properties of the ExtendedFeature. Unless explicitly ruled out, the properties value is nullable.

### property geometry

`geometry: GeometryType;`

### property id

`id?: string | number | undefined;`

### property properties

`properties: Properties;`

### interface ExtendedFeatureCollection

`interface ExtendedFeatureCollection< FeatureType extends ExtendedFeature = ExtendedFeature> extends GeoJSON.GeoJsonObject {}`

A GeoJSON-style FeatureCollection which supports GeoJSON features and features built on GeoSphere

The generic refers to the type of ExtendedFeature contained in the ExtendedFeatureCollection.

### property features

`features: FeatureType[];`

### interface ExtendedGeometryCollection

`interface ExtendedGeometryCollection< GeometryType extends GeoGeometryObjects = GeoGeometryObjects> {}`

A GeoJSON-style GeometryCollection which supports GeoJSON geometry objects and additionally GeoSphere.

The generic refers to the type(s) of d3-geo geometry objects contained in the collection.

### property bbox

`bbox?: number[] | undefined;`

### property crs

`crs?: | { type: string; properties: any; } | undefined;`

### property geometries

`geometries: GeometryType[];`

### property type

`type: string;`

### interface GeoCircleGenerator

`interface GeoCircleGenerator<This = any, Datum = any> {}`

A new circle generator

The first generic corresponds to the "this"-context within which the geo circle generator will be invoked.

The second generic corresponds to the type of the Datum which will be passed into the geo circle generator.

### method center

`center: { (): (this: This, d: Datum, ...args: any[]) => [number, number]; ( center: | [number, number] | ((this: This, d: Datum, ...args: any[]) => [number, number]) ): this;};`

Returns the current center accessor, which defaults to a function returning [0, 0].

Sets the circle center to the specified point [longitude, latitude] in degrees, and returns this circle generator. The center may also be specified as a function; this function will be invoked whenever a circle is generated, being passed any arguments passed to the circle generator.

### method precision

`precision: { (): (this: This, d: Datum, ...args: any[]) => number; ( precision: number | ((this: This, d: Datum, ...args: any[]) => number) ): this;};`

Returns the current precision accessor, which defaults to a function returning 6.

Sets the circle precision to the specified angle in degrees, and returns this circle generator. The precision may also be specified as a function; this function will be invoked whenever a circle is generated, being passed any arguments passed to the circle generator.

### method radius

`radius: { (): (this: This, d: Datum, ...args: any[]) => number; (radius: number | ((this: This, d: Datum, ...args: any[]) => number)): this;};`

Returns the current radius accessor, which defaults to a function returning 90.

Sets the circle radius to the specified angle in degrees, and returns this circle generator. The radius may also be specified as a function; this function will be invoked whenever a circle is generated, being passed any arguments passed to the circle generator.

### call signature

`(this: This, d?: Datum, ...args: any[]): GeoJSON.Polygon;`

Returns a new GeoJSON geometry object of type “Polygon” approximating a circle on the surface of a sphere, with the current center, radius and precision. Any arguments are passed to the accessors.

### interface GeoConicProjection

`interface GeoConicProjection extends GeoProjection {}`

A Conic Projection

### method parallels

`parallels: { (): [number, number]; (value: [number, number]): this };`

Return the standard parallels for the conic projection in degrees.

Set the standard parallels for the conic projection in degrees and return the projection.

#### Parameter value

A two-dimensional array representing the standard parallels in degrees.

### interface GeoContext

`interface GeoContext {}`

A minimal rendering context for a GeoPath generator. The minimum implemented methods are a subset of the CanvasRenderingContext2D API.

For reference to the CanvasRenderingContext2D see https://developer.mozilla.org/en/docs/Web/API/CanvasRenderingContext2D

### method arc

`arc: ( x: number, y: number, radius: number, startAngle: number, endAngle: number, anticlockwise?: boolean) => void;`

Adds an arc to the path with center point (x, y) and radius r starting at startAngle and ending at endAngle. The arc is drawn in clockwise direction by default.

#### Parameter x

x-coordinate of arc center point.

#### Parameter y

y-coordinate of arc center point.

#### Parameter radius

Radius of arc.

#### Parameter startAngle

The starting angle of the arc, measured clockwise from the positive x axis and expressed in radians.

#### Parameter endAngle

The end angle of the arc, measured clockwise from the positive x axis and expressed in radians.

#### Parameter anticlockwise

Optional boolean flag, if true the arc is drawn counter-clockwise between the two angles.

### method beginPath

`beginPath: () => void;`

Start a new path by emptying the list of sub-paths.

### method closePath

`closePath: () => void;`

Causes the point of the pen to move back to the start of the current sub-path. It tries to draw a straight line from the current point to the start. If the shape has already been closed or has only one point, this function does nothing.

### method lineTo

`lineTo: (x: number, y: number) => void;`

Connects the last point in the sub-path to the x, y coordinates with a straight line (but does not actually draw it).

#### Parameter x

The x-coordinate for the end of the line.

#### Parameter y

The y-coordinate for the end of the line.

### method moveTo

`moveTo: (x: number, y: number) => void;`

Move the starting point of a new sub-path to the (x, y) coordinates.

#### Parameter x

The x-coordinate for the new starting point.

#### Parameter y

The y-coordinate for the new starting point.

### interface GeoGraticuleGenerator

`interface GeoGraticuleGenerator {}`

A Feature generator for graticules: a uniform grid of meridians and parallels for showing projection distortion. The default graticule has meridians and parallels every 10° between ±80° latitude; for the polar regions, there are meridians every 90°.

### method extent

`extent: { (): [[number, number], [number, number]]; (extent: [[number, number], [number, number]]): this;};`

Returns the current minor extent, which defaults to ⟨⟨-180°, -80° - ε⟩, ⟨180°, 80° + ε⟩⟩.

Sets the major and minor extents of this graticule.

#### Parameter extent

Extent to use for major and minor extent of graticule.

### method extentMajor

`extentMajor: { (): [[number, number], [number, number]]; (extent: [[number, number], [number, number]]): this;};`

Returns the current major extent, which defaults to ⟨⟨-180°, -90° + ε⟩, ⟨180°, 90° - ε⟩⟩.

Sets the major extent of this graticule.

#### Parameter extent

Major extent of graticule.

### method extentMinor

`extentMinor: { (): [[number, number], [number, number]]; (extent: [[number, number], [number, number]]): this;};`

Returns the current minor extent, which defaults to ⟨⟨-180°, -80° - ε⟩, ⟨180°, 80° + ε⟩⟩.

Sets the minor extent of this graticule.

#### Parameter extent

Minor extent of graticule.

### method lines

`lines: () => GeoJSON.LineString[];`

Returns an array of GeoJSON LineString geometry objects, one for each meridian or parallel for this graticule.

### method outline

`outline: () => GeoJSON.Polygon;`

Returns a GeoJSON Polygon geometry object representing the outline of this graticule, i.e. along the meridians and parallels defining its extent.

### method precision

`precision: { (): number; (angle: number): this };`

Returns the current precision, which defaults to 2.5°.

Sets the precision for this graticule, in degrees.

#### Parameter angle

Precision in degrees.

### method step

`step: { (): [number, number]; (step: [number, number]): this };`

Returns the current minor step, which defaults to ⟨10°, 10°⟩.

Sets the major and minor step for this graticule

#### Parameter step

Major and minor step to use for this graticule.

### method stepMajor

`stepMajor: { (): [number, number]; (step: [number, number]): this };`

Returns the current major step, which defaults to ⟨90°, 360°⟩.

Sets the major step for this graticule.

#### Parameter step

Major step.

### method stepMinor

`stepMinor: { (): [number, number]; (step: [number, number]): this };`

Returns the current major step, which defaults to ⟨10°, 10°⟩.

Sets the minor step for this graticule.

#### Parameter step

Minor step.

### call signature

`(): GeoJSON.MultiLineString;`

Returns a GeoJSON MultiLineString geometry object representing all meridians and parallels for this graticule.

### interface GeoIdentityTransform

`interface GeoIdentityTransform extends GeoStreamWrapper {}`

Geo Identity Transform

### method angle

`angle: { (): number; (angle: number): this };`

Returns the projection’s current angle, which defaults to 0°.

Sets the projection’s post-projection planar rotation angle to the specified angle in degrees and returns the projection.

#### Parameter angle

The new rotation angle of the projection.

### method clipExtent

`clipExtent: { (): [[number, number], [number, number]] | null; (extent: [[number, number], [number, number]]): this;};`

Returns the current viewport clip extent which defaults to null.

Sets the projection’s viewport clip extent to the specified bounds in pixels and returns the projection. The extent bounds are specified as an array [[x₀, y₀], [x₁, y₁]], where x₀ is the left-side of the viewport, y₀ is the top, x₁ is the right and y₁ is the bottom. If extent is null, no viewport clipping is performed.

### method fitExtent

`fitExtent: ( extent: [[number, number], [number, number]], object: | ExtendedFeature | ExtendedFeatureCollection | GeoGeometryObjects | ExtendedGeometryCollection) => this;`

Sets the projection’s scale and translate to fit the specified GeoJSON object in the center of the given extent. The extent is specified as an array [[x₀, y₀], [x₁, y₁]], where x₀ is the left side of the bounding box, y₀ is the top, x₁ is the right and y₁ is the bottom. Returns the projection.

### method fitSize

`fitSize: ( size: [number, number], object: | ExtendedFeature | ExtendedFeatureCollection | GeoGeometryObjects | ExtendedGeometryCollection) => this;`

A convenience method for projection.fitExtent where the top-left corner of the extent is [0, 0].

### method invert

`invert: (point: [number, number]) => [number, number] | null;`

Returns a new array [longitude, latitude] in degrees representing the unprojected point of the given projected point. May return null if the specified point has no defined projected position, such as when the point is outside the clipping bounds of the projection.

#### Parameter point

The projected point, specified as a two-element array [x, y] (typically in pixels).

### method postclip

`postclip: { (): (stream: GeoStream) => GeoStream; (postclip: (stream: GeoStream) => GeoStream): this;};`

Returns the current cartesian clipping function. Post-clipping occurs on the plane, when a projection is bounded to a certain extent such as a rectangle.

Sets the projection’s cartesian clipping to the specified function and returns the projection.

#### Parameter postclip

A cartesian clipping function. Clipping functions are implemented as transformations of a projection stream. Post-clipping operates on planar coordinates, in pixels.

### method reflectX

`reflectX: { (): boolean; (reflect: boolean): this };`

Returns true if x-reflection is enabled, which defaults to false.

Sets whether or not the x-dimension is reflected (negated) in the output.

#### Parameter reflect

true = reflect x-dimension, false = do not reflect x-dimension.

### method reflectY

`reflectY: { (): boolean; (reflect: boolean): this };`

Returns true if y-reflection is enabled, which defaults to false.

Sets whether or not the y-dimension is reflected (negated) in the output.

This is especially useful for transforming from standard spatial reference systems, which treat positive y as pointing up, to display coordinate systems such as Canvas and SVG, which treat positive y as pointing down.

#### Parameter reflect

true = reflect y-dimension, false = do not reflect y-dimension.

### method scale

`scale: { (): number; (scale: number): this };`

Returns the current scale factor.

The scale factor corresponds linearly to the distance between projected points; however, absolute scale factors are not equivalent across projections.

Sets the projection’s scale factor to the specified value and returns the projection. The scale factor corresponds linearly to the distance between projected points; however, absolute scale factors are not equivalent across projections.

#### Parameter scale

Scale factor to be used for the projection.

### method translate

`translate: { (): [number, number]; (point: [number, number]): this };`

Returns the current translation offset. The translation offset determines the pixel coordinates of the projection’s center.

Sets the projection’s translation offset to the specified two-element array [tx, ty] and returns the projection. The translation offset determines the pixel coordinates of the projection’s center.

#### Parameter point

A two-element array [tx, ty] specifying the translation offset.

### call signature

`(point: [number, number]): [number, number] | null;`

Returns a new array [x, y] (typically in pixels) representing the projected point of the given point. The point must be specified as a two-element array [longitude, latitude] in degrees. May return null if the specified point has no defined projected position, such as when the point is outside the clipping bounds of the projection.

#### Parameter point

A point specified as a two-dimensional array [longitude, latitude] in degrees.

### interface GeoPath

`interface GeoPath< This = any, DatumObject extends GeoPermissibleObjects = GeoPermissibleObjects> {}`

A Geo Path generator

The first generic corresponds to the "this"-context within which the geo path generator will be invoked. This could be e.g. the DOMElement bound to "this" when using selection.attr("d", ...) with the path generator.

The second generic corresponds to the type of the DatumObject which will be passed into the geo path generator for rendering.

### method area

`area: (object: DatumObject) => number;`

Returns the projected planar area (typically in square pixels) for the specified GeoJSON object. Point, MultiPoint, LineString and MultiLineString geometries have zero area. For Polygon and MultiPolygon geometries, this method first computes the area of the exterior ring, and then subtracts the area of any interior holes. This method observes any clipping performed by the projection; see projection.clipAngle and projection.clipExtent. This is the planar equivalent of d3.geoArea.

#### Parameter object

An object for which the area is to be calculated.

### method bounds

`bounds: (object: DatumObject) => [[number, number], [number, number]];`

Returns the projected planar bounding box (typically in pixels) for the specified GeoJSON object. The bounding box is represented by a two-dimensional array: [[x₀, y₀], [x₁, y₁]], where x₀ is the minimum x-coordinate, y₀ is the minimum y-coordinate, x₁ is maximum x-coordinate, and y₁ is the maximum y-coordinate.

This is handy for, say, zooming in to a particular feature. (Note that in projected planar coordinates, the minimum latitude is typically the maximum y-value, and the maximum latitude is typically the minimum y-value.) This method observes any clipping performed by the projection; see projection.clipAngle and projection.clipExtent. This is the planar equivalent of d3.geoBounds.

#### Parameter object

An object for which the bounds are to be calculated.

### method centroid

`centroid: (object: DatumObject) => [number, number];`

Returns the projected planar centroid (typically in pixels) for the specified GeoJSON object. This is handy for, say, labeling state or county boundaries, or displaying a symbol map. For example, a noncontiguous cartogram might scale each state around its centroid. This method observes any clipping performed by the projection; see projection.clipAngle and projection.clipExtent. This is the planar equivalent of d3.geoCentroid.

#### Parameter object

An object for which the centroid is to be calculated.

### method context

`context: { <C extends GeoContext>(): C; (context: GeoContext): this };`

Returns the current render context which defaults to null.

Use the generic to cast the return type of the rendering context, if it is known for a specific application.

sets the current render context and returns the path generator. If the context is null, then the path generator will return an SVG path string; if the context is non-null, the path generator will instead call methods on the specified context to render geometry.

### method measure

`measure: (object: DatumObject) => number;`

Returns the projected planar length (typically in pixels) for the specified GeoJSON object. Point and MultiPoint geometries have zero length. For Polygon and MultiPolygon geometries, this method computes the summed length of all rings.

This method observes any clipping performed by the projection; see projection.clipAngle and projection.clipExtent. This is the planar equivalent of d3.geoLength.

#### Parameter object

An object for which the measure is to be calculated.

### method pointRadius

`pointRadius: { (): number | ((this: This, object: DatumObject, ...args: any[]) => number); ( value: | number | ((this: This, object: DatumObject, ...args: any[]) => number) ): this;};`

Returns the current radius or radius accessor used to determine the radius for the display of Point and MultiPoint geometries. The default is a constant radius of 4.5.

Sets the radius used to display Point and MultiPoint geometries to the specified number. While the radius is commonly specified as a number constant, it may also be specified as a function which is computed per feature, being passed the any arguments passed to the path generator. For example, if your GeoJSON data has additional properties, you might access those properties inside the radius function to vary the point size; alternatively, you could d3.symbol and a projection for greater flexibility.

### method projection

`projection: { <P extends GeoProjection | GeoStreamWrapper | GeoConicProjection>(): P; (projection: GeoProjection | GeoStreamWrapper): this;};`

Get the current projection. The generic parameter can be used to cast the result to the correct, known type of the projection, e.g. GeoProjection or GeoConicProjection. Otherwise, the return type defaults to the minimum type requirement for a projection which can be passed into a GeoPath.

Use the generic to cast the return type of the projection, if it is known for a specific application.

Sets the current projection to the specified projection. The null projection represents the identity transformation: the input geometry is not projected and is instead rendered directly in raw coordinates. This can be useful for fast rendering of pre-projected geometry, or for fast rendering of the equirectangular projection.

### call signature

`(this: This, object: DatumObject, ...args: any[]): string | null;`

Renders the given object, which may be any GeoJSON feature or geometry object:

+ Point - a single position. + MultiPoint - an array of positions. + LineString - an array of positions forming a continuous line. + MultiLineString - an array of arrays of positions forming several lines. + Polygon - an array of arrays of positions forming a polygon (possibly with holes). + MultiPolygon - a multidimensional array of positions forming multiple polygons. + GeometryCollection - an array of geometry objects. + Feature - a feature containing one of the above geometry objects. + FeatureCollection - an array of feature objects.

The type Sphere is also supported, which is useful for rendering the outline of the globe; a sphere has no coordinates.

Any additional arguments are passed along to the pointRadius accessor.

IMPORTANT: If the rendering context of the geoPath generator is null, then the geoPath is returned as an SVG path data string.

Separate path elements are typically slower than a single path element. However, distinct path elements are useful for styling and interaction (e.g., click or mouseover). Canvas rendering (see path.context) is typically faster than SVG, but requires more effort to implement styling and interaction.

The first generic type of the GeoPath generator used, must correspond to the "this" context bound to the function upon invocation.

#### Parameter object

An object to be rendered.

### call signature

`(this: This, object: DatumObject, ...args: any[]): void;`

Renders the given object, which may be any GeoJSON feature or geometry object:

+ Point - a single position. + MultiPoint - an array of positions. + LineString - an array of positions forming a continuous line. + MultiLineString - an array of arrays of positions forming several lines. + Polygon - an array of arrays of positions forming a polygon (possibly with holes). + MultiPolygon - a multidimensional array of positions forming multiple polygons. + GeometryCollection - an array of geometry objects. + Feature - a feature containing one of the above geometry objects. + FeatureCollection - an array of feature objects.

The type Sphere is also supported, which is useful for rendering the outline of the globe; a sphere has no coordinates.

Any additional arguments are passed along to the pointRadius accessor.

IMPORTANT: If the geoPath generator has been configured with a rendering context, then the geoPath is rendered to this context as a sequence of path method calls and this function returns void.

Separate path elements are typically slower than a single path element. However, distinct path elements are useful for styling and interaction (e.g., click or mouseover). Canvas rendering (see path.context) is typically faster than SVG, but requires more effort to implement styling and interaction.

The first generic type of the GeoPath generator used, must correspond to the "this" context bound to the function upon invocation.

#### Parameter object

An object to be rendered.

### interface GeoProjection

`interface GeoProjection extends GeoStreamWrapper {}`

A Geographic Projection to transform spherical polygonal geometry to planar polygonal geometry. D3 provides implementations of several classes of standard projections:

- Azimuthal - Composite - Conic - Cylindrical

For many more projections, see d3-geo-projection. You can implement custom projections using d3.geoProjection or d3.geoProjectionMutator.

### method angle

`angle: { (): number; (angle: number): this };`

Returns the projection’s current angle, which defaults to 0°.

Sets the projection’s post-projection planar rotation angle to the specified angle in degrees and returns the projection.

#### Parameter angle

The new rotation angle of the projection.

### method center

`center: { (): [number, number]; (point: [number, number]): this };`

Returns the current center of the projection, which defaults to ⟨0°,0°⟩.

Sets the projection’s center to the specified center, a two-element array of longitude and latitude in degrees and returns the projection. The default is ⟨0°,0°⟩.

#### Parameter point

A point specified as a two-dimensional array [longitude, latitude] in degrees.

### method clipAngle

`clipAngle: { (): number | null; (angle: number): this };`

Returns the current clip angle which defaults to null.

null switches to antimeridian cutting rather than small-circle clipping.

Sets the projection’s clipping circle radius to the specified angle in degrees and returns the projection. If angle is null, switches to antimeridian cutting rather than small-circle clipping.

### method clipExtent

`clipExtent: { (): [[number, number], [number, number]] | null; (extent: [[number, number], [number, number]]): this;};`

Returns the current viewport clip extent which defaults to null.

Sets the projection’s viewport clip extent to the specified bounds in pixels and returns the projection. The extent bounds are specified as an array [[x₀, y₀], [x₁, y₁]], where x₀ is the left-side of the viewport, y₀ is the top, x₁ is the right and y₁ is the bottom. If extent is null, no viewport clipping is performed.

### method fitExtent

`fitExtent: ( extent: [[number, number], [number, number]], object: | ExtendedFeature | ExtendedFeatureCollection | GeoGeometryObjects | ExtendedGeometryCollection) => this;`

Sets the projection’s scale and translate to fit the specified GeoJSON object in the center of the given extent. The extent is specified as an array [[x₀, y₀], [x₁, y₁]], where x₀ is the left side of the bounding box, y₀ is the top, x₁ is the right and y₁ is the bottom. Returns the projection.

### method fitHeight

`fitHeight: ( height: number, object: | ExtendedFeature | ExtendedFeatureCollection | GeoGeometryObjects | ExtendedGeometryCollection) => this;`

A convenience method for projection.fitSize where the width is automatically chosen from the aspect ratio of object and the given constraint on height.

### method fitSize

`fitSize: ( size: [number, number], object: | ExtendedFeature | ExtendedFeatureCollection | GeoGeometryObjects | ExtendedGeometryCollection) => this;`

A convenience method for projection.fitExtent where the top-left corner of the extent is [0, 0].

### method fitWidth

`fitWidth: ( width: number, object: | ExtendedFeature | ExtendedFeatureCollection | GeoGeometryObjects | ExtendedGeometryCollection) => this;`

A convenience method for projection.fitSize where the height is automatically chosen from the aspect ratio of object and the given constraint on width.

### method invert

`invert: (point: [number, number]) => [number, number] | null;`

Returns a new array [longitude, latitude] in degrees representing the unprojected point of the given projected point. May return null if the specified point has no defined projected position, such as when the point is outside the clipping bounds of the projection.

#### Parameter point

The projected point, specified as a two-element array [x, y] (typically in pixels).

### method postclip

`postclip: { (): (stream: GeoStream) => GeoStream; (postclip: (stream: GeoStream) => GeoStream): this;};`

Returns the current cartesian clipping function. Post-clipping occurs on the plane, when a projection is bounded to a certain extent such as a rectangle.

Sets the projection’s cartesian clipping to the specified function and returns the projection.

#### Parameter postclip

A cartesian clipping function. Clipping functions are implemented as transformations of a projection stream. Post-clipping operates on planar coordinates, in pixels.

### method precision

`precision: { (): number; (precision: number): this };`

Returns the projection’s current resampling precision which defaults to square root of 0.5. This value corresponds to the Douglas–Peucker distance.

Sets the threshold for the projection’s adaptive resampling to the specified value in pixels and returns the projection. This value corresponds to the Douglas–Peucker distance.

#### Parameter precision

A numeric value in pixels to use as the threshold for the projection’s adaptive resampling.

### method preclip

`preclip: { (): (stream: GeoStream) => GeoStream; (preclip: (stream: GeoStream) => GeoStream): this;};`

Returns the current spherical clipping function. Pre-clipping occurs in geographic coordinates. Cutting along the antimeridian line, or clipping along a small circle are the most common strategies.

Sets the projection’s spherical clipping to the specified function and returns the projection. Pre-clipping occurs in geographic coordinates. Cutting along the antimeridian line, or clipping along a small circle are the most common strategies.

#### Parameter preclip

A spherical clipping function. Clipping functions are implemented as transformations of a projection stream. Pre-clipping operates on spherical coordinates, in radians.

### method reflectX

`reflectX: { (): boolean; (reflect: boolean): this };`

Returns true if x-reflection is enabled, which defaults to false.

Sets whether or not the x-dimension is reflected (negated) in the output.

#### Parameter reflect

Whether or not the x-dimension is reflected (negated) in the output.

### method reflectY

`reflectY: { (): boolean; (reflect: boolean): this };`

Returns true if y-reflection is enabled, which defaults to false.

Sets whether or not the y-dimension is reflected (negated) in the output.

#### Parameter reflect

Whether or not the y-dimension is reflected (negated) in the output.

### method rotate

`rotate: { (): [number, number, number]; (angles: [number, number] | [number, number, number]): this;};`

Returns the current rotation [lambda, phi, gamma] specifying the rotation angles in degrees about each spherical axis. (These correspond to yaw, pitch and roll.) which defaults [0, 0, 0].

Sets the projection’s three-axis rotation to the specified angles, which must be a two- or three-element array of numbers.

#### Parameter angles

A two- or three-element array of numbers [lambda, phi, gamma] specifying the rotation angles in degrees about each spherical axis. (These correspond to yaw, pitch and roll.) If the rotation angle gamma is omitted, it defaults to 0.

### method scale

`scale: { (): number; (scale: number): this };`

Returns the current scale factor; the default scale is projection-specific.

The scale factor corresponds linearly to the distance between projected points; however, absolute scale factors are not equivalent across projections.

Sets the projection’s scale factor to the specified value and returns the projection. The scale factor corresponds linearly to the distance between projected points; however, absolute scale factors are not equivalent across projections.

#### Parameter scale

Scale factor to be used for the projection; the default scale is projection-specific.

### method translate

`translate: { (): [number, number]; (point: [number, number]): this };`

Returns the current translation offset which defaults to [480, 250] and places ⟨0°,0°⟩ at the center of a 960×500 area. The translation offset determines the pixel coordinates of the projection’s center.

Sets the projection’s translation offset to the specified two-element array [tx, ty] and returns the projection. The translation offset determines the pixel coordinates of the projection’s center. The default translation offset places ⟨0°,0°⟩ at the center of a 960×500 area.

#### Parameter point

A two-element array [tx, ty] specifying the translation offset. The default translation offset of defaults to [480, 250] places ⟨0°,0°⟩ at the center of a 960×500 area.

### call signature

`(point: [number, number]): [number, number] | null;`

Returns a new array [x, y] (typically in pixels) representing the projected point of the given point. The point must be specified as a two-element array [longitude, latitude] in degrees. May return null if the specified point has no defined projected position, such as when the point is outside the clipping bounds of the projection.

#### Parameter point

A point specified as a two-dimensional array [longitude, latitude] in degrees.

### interface GeoRawProjection

`interface GeoRawProjection {}`

Raw projections are point transformation functions that are used to implement custom projections; they typically passed to d3.geoProjection or d3.geoProjectionMutator. They are exposed here to facilitate the derivation of related projections. Raw projections take spherical coordinates [lambda, phi] in radians (not degrees!) and return a point [x, y], typically in the unit square centered around the origin.

### method invert

`invert: (x: number, y: number) => [number, number];`

Inverts the projected point [x, y] in unitless coordinates, returning an unprojected point in spherical coordinates [lambda, phi] in radians.

#### Parameter x

x-coordinate (unitless).

#### Parameter y

y-coordinate (unitless).

### call signature

`(lambda: number, phi: number): [number, number];`

Projects the specified point [lambda, phi] in radians, returning a new point [x, y] in unitless coordinates.

#### Parameter lambda

Spherical lambda coordinate in radians.

#### Parameter phi

Spherical phi coordinate in radians.

### interface GeoRotation

`interface GeoRotation {}`

A Geo Rotation

### method invert

`invert: (point: [number, number]) => [number, number];`

Returns a new array [longitude, latitude] in degrees representing the point of the given rotated point; the inverse of rotation.

#### Parameter point

The rotated point must be specified as a two-element array [longitude, latitude] in degrees.

### call signature

`(point: [number, number]): [number, number];`

Returns a new array [longitude, latitude] in degrees representing the rotated point of the given point.

#### Parameter point

The point must be specified as a two-element array [longitude, latitude] in degrees.

### interface GeoSphere

`interface GeoSphere {}`

A basic geometry for a sphere, which is supported by d3-geo beyond the GeoJSON geometries.

### property type

`type: 'Sphere';`

Sphere geometry type

### interface GeoStream

`interface GeoStream {}`

A D3 geo stream. D3 transforms geometry using a sequence of function calls, rather than materializing intermediate representations, to minimize overhead. Streams must implement several methods to receive input geometry. Streams are inherently stateful; the meaning of a point depends on whether the point is inside of a line, and likewise a line is distinguished from a ring by a polygon. Despite the name “stream”, these method calls are currently synchronous.

### method lineEnd

`lineEnd: () => void;`

Indicates the end of a line or ring. Within a polygon, indicates the end of a ring. Unlike GeoJSON, the redundant closing coordinate of a ring is not indicated via point, and instead is implied via lineEnd within a polygon.

### method lineStart

`lineStart: () => void;`

Indicates the start of a line or ring. Within a polygon, indicates the start of a ring. The first ring of a polygon is the exterior ring, and is typically clockwise. Any subsequent rings indicate holes in the polygon, and are typically counterclockwise.

### method point

`point: (x: number, y: number, z?: number) => void;`

Indicates a point with the specified coordinates x and y (and optionally z). The coordinate system is unspecified and implementation-dependent; for example, projection streams require spherical coordinates in degrees as input. Outside the context of a polygon or line, a point indicates a point geometry object (Point or MultiPoint). Within a line or polygon ring, the point indicates a control point.

#### Parameter x

x-coordinate of point.

#### Parameter y

y-coordinate of point.

#### Parameter z

Optional z-coordinate of point.

### method polygonEnd

`polygonEnd: () => void;`

Indicates the end of a polygon.

### method polygonStart

`polygonStart: () => void;`

Indicates the start of a polygon. The first line of a polygon indicates the exterior ring, and any subsequent lines indicate interior holes.

### method sphere

`sphere: () => void;`

Indicates the sphere (the globe; the unit sphere centered at ⟨0,0,0⟩).

### interface GeoStreamWrapper

`interface GeoStreamWrapper {}`

An object implementing a stream method

### method stream

`stream: (stream: GeoStream) => GeoStream;`

Returns a projection stream for the specified output stream. Any input geometry is projected before being streamed to the output stream. A typical projection involves several geometry transformations: the input geometry is first converted to radians, rotated on three axes, clipped to the small circle or cut along the antimeridian, and lastly projected to the plane with adaptive resampling, scale and translation.

#### Parameter stream

An input stream

### interface GeoTransformPrototype

`interface GeoTransformPrototype {}`

A Prototype interface which serves as a template for the implementation of a geometric transform using geoTransform(...) It serves as a reference for the custom methods which can be passed into geoTransform as argument to crete a generalized transform projection.

### method lineEnd

`lineEnd: (this: this & { stream: GeoStream }) => void;`

Indicates the end of a line or ring. Within a polygon, indicates the end of a ring. Unlike GeoJSON, the redundant closing coordinate of a ring is not indicated via point, and instead is implied via lineEnd within a polygon.

### method lineStart

`lineStart: (this: this & { stream: GeoStream }) => void;`

Indicates the start of a line or ring. Within a polygon, indicates the start of a ring. The first ring of a polygon is the exterior ring, and is typically clockwise. Any subsequent rings indicate holes in the polygon, and are typically counterclockwise.

### method point

`point: ( this: this & { stream: GeoStream }, x: number, y: number, z?: number) => void;`

Indicates a point with the specified coordinates x and y (and optionally z). The coordinate system is unspecified and implementation-dependent; for example, projection streams require spherical coordinates in degrees as input. Outside the context of a polygon or line, a point indicates a point geometry object (Point or MultiPoint). Within a line or polygon ring, the point indicates a control point.

#### Parameter x

x-coordinate of point.

#### Parameter y

y-coordinate of point.

#### Parameter z

Optional z-coordinate of point.

### method polygonEnd

`polygonEnd: (this: this & { stream: GeoStream }) => void;`

Indicates the end of a polygon.

### method polygonStart

`polygonStart: (this: this & { stream: GeoStream }) => void;`

Indicates the start of a polygon. The first line of a polygon indicates the exterior ring, and any subsequent lines indicate interior holes.

### method sphere

`sphere: (this: this & { stream: GeoStream }) => void;`

Indicates the sphere (the globe; the unit sphere centered at ⟨0,0,0⟩).

## Type Aliases

### type GeoGeometryObjects

`type GeoGeometryObjects = GeoJSON.GeometryObject | GeoSphere;`

Type Alias for GeoJSON Geometry Object and GeoSphere additional geometry supported by d3-geo

### type GeoIdentityTranform

`type GeoIdentityTranform = GeoIdentityTransform;`

#### Deprecated

Misspelled name. Use GeoIdentityTransform.

### type GeoPermissibleObjects

`type GeoPermissibleObjects = | GeoGeometryObjects | ExtendedGeometryCollection | ExtendedFeature | ExtendedFeatureCollection;`

Type Alias for permissible objects which can be used with d3-geo methods

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